Hydraulic digger and loader



L A T E H T R O N B R HYDRAULIC DIGGER AND LOADER Filed June l5, 1928 6 Sheets-Sheet l se @e WNS Jun@ 21, w32. R1. B. NORTH ET AL Lsg@ HYDRAULIC DIGGER AND LOADER Filed June 15. 1928 6 Sheets-She??l 2 I I l I [i June 2li, 1932. B NORTH E11-AL Y mLgg HYDRAULIC BIGGER AND LOADER Filed June 15. 1928 e sheets-sheet s June 2l, R- B NCR-TH ET AL l HYDRAULIC DIGGER AND LOADER Filed June 15. 1928 6 sheets-sheet 4 Tune 2l, W32. R B. NORTH ETAL 'g HYDRAULIC DIGGER AND LOADER Filed June 15, 1928 e Sheets-sheet 5 /5 June 2L E932. R. B. NORTH ET Au.

HYDRAULIC DIGGER AND LOAIWD Filed June l5, 1928 6 Sheets-Sheet 6 /z/en fors.-

` Patented June 21, 1932 UNITED 'STATES' P A'raNr-orFica nUssELL n. Noma, FRANK e. Hoven, nm nor-AL 3.1mm, oir cnrcaeo. 'n.nniors, assreicons 'ro WILLIAM mcaannnnam, or cincaeo. :Lunetta HYDRAULIC BIGGER AND LOADER i appiimioa antigenic, isas.- semi lo. nanas. j

This invention relatesv to hydraulic "diggers and loaders, and more particularly to the provision of such a construction adapted for attachment with a tractor and adapted to lift material to a relatively great alti# tuile, or to intermediary positions.

Amon the objects of our inventionare to provi e a hydraulic digger and loader of novel construction and ada ted to be readily operated by the operator. o the tractor' further to provide a novel construction of lifting means for said digger and loader; further 4 to provide a novel construction of hydraulic valve mechanism for lifting, lowering and holding the mechanism and scoop or shovel in various positions; further to provide a hydraulic digger and loader of, maximum simplicity, e ciency, economy and ease of operation; and such further objects, advantages and capabilities as will laterymore fully appear.

Our invention further resides in the com bination, construction 4and arrangement of parts illustrated in the accompanying drawings, and while-we have shown therein a refer-red embodiment, we desire it to be un erstood that the same is susceptible of modiica-v tion and change without departing from the spirit of our invention.

In the drawings:

Fig. 1 is a vertical cross sectional view 'on line 1-1 of Fig. 3. and disclosing our hydraulic digger and loader as combined with a tractor.

Fig. 8 is a fragmentary enlarged view of Fig. 2 is a view similar to Fig. 1, but dis-` closing the lifting mechanism and bucketpor v the catch guide slide sami in Fig-7, but

lug on the boom, the buc in artially raised position. I

ig. 9 is a horizontal cross sectional view on the line '9-9. of Fig. 7. f .Fi ..10 is a vvertical cross sectional view'on the line l0-10 of Fig. 7. Y

Fig. 11 is a cross sectional view of the valve mechanism but showing a portion thereof in side elevation. n

Fi 12 a vertical cross sectional view on the line 124-12 of Fig. 11. v.

Fi 13 is a vertical cross sectional view on the line 13--13 of Fig. 11, and showing the valve mechanism in the lifting position.

Figs. 14 and 15 are similar'views to Fig. 13, but disclosing the valve mechanism in the lowering and holding positions res ectively.

Fig. 16 is a fragmentary view in side elevation of the means of detaching the bucket or,- scoop. v

- Fig. 17 is a fragmentary cross sectional viewtaken on the line 17-17 of Fig. 16.

Referring to th drawings, the numeral 1 designates generally a tractor provided with front steerable wheels 2 and rear driving wheels 3. Our novel construction of h draulicdigger and loader is adapted to e et or shovel applied to the ordinary tractor and this construction is clearly disclosed in Figs. 1, 2 and 3 of the drawings. v

The booms for raising the bucket comprise a tubular arm 4 rigidly secured to a casting 5, which casting in turn is pivotally mounted upon the rear axle 6 of the tractor. Slidably mounted on the arm 4 is a sleeve 7 having a bracket 8 rigidly secured `to an H-beam' 9- forming the forward portion of the boom. The front and of the membr 9 issecured to the bucket bracket 10 for holding the bucket [or scoop 11.' One of these booms are attached tothe opposite'sides of the tractor. A brace axle without any strain upon the remaining ,loo

members of the mechanism.

showing the same in engagement with the 4 member 12 is yattached to an upwardly extending arm 12a on the bracket7 vand to the `bucket bracket 10. vBy the construction of Mounted onthe opposite sides` of the forward end of the tractor are vertical T-beams 13 attached to a cylinder bracket 14 at their lower end and to a plate 15 at their upper end.

- Knee brackets 16 are further provided for lbracing the upright beams, which knee brackets ar'egn turn attached to an underhracket 17 passing beneath the power plant of the` tractor and attached thereto. brace rods 18 are attached to the housing of the power plant at their lower end and to the ilaiges of the upright T-beanis at their upper en Y The construction of bracing means and diagonal bracing rods provides a rigid coustruction and holds the upright members in fixed position. Slidably mounted on the u right members are provided boom gui e slides 19. These slides are vprovided with a cut-out portion having an outwardly extending flange 20 and an angular flange 21 and are limited in their down-ward movementv by means of stops 21. These guides 19 are adapted to be engaged by arcuate projections 22 mounted upon the upper flange of the H-beams 9.

' A cable 23 is attached by means of eyes 24 to the inwardly extending portions 25 of the bracket 10. These cables pass over an upper. pulley'26 and then over a lower pulley and -the upper end of the cable is then attached to a .cross head 28, thus providing a three part line for increasing the speed of lift of the bucket. This cross head 28 is mounted on the upper end of piston rod 2 of a piston (not disclosed) mounted in the cylindrical casing 30. The lower portion of the cylinder 30 is mounted in the bracket 14 and its upper end is braced by means of a plate 30" provided with a U-bolt 30b passing around cylinder or casing 30. The piston power take-ofi' of thetractor. This bevel gear is mounted upon a shaft 32 passing through a housing 33 and into the gear pump 31. Mounted within the pump and directly upon the shaft'32l is a gear 34 keyed. to the shaft as shown clearly in Fig. 12. The gear 34 in turn meshes with and drives a similar gear. 35 mounted in the well 36 of the pump. A bushing 37 for the shaft 32 is keyed to the outer casing of the gear pump, while bushings 38 and 39 for the shaft 40 are also keyed Diagonal Lacasse" to the outer casing, thus preventing any rotation of the bearings or bushings. Y

- A valve 41 is mounted in the upper portion of the gear casing. This valve is located directly in the outlet of the gear pump. The means for operating thevalve 41 and thus controlling theoutlet from' .the pump, comprises a shaft' 42 provided on ltlie'out'sidc of the casing with a pair of fingers 43 and 44. These fingers are mountedv on afbcllcrank 45, which Ain turn is connected to an arm 46 pivotally connected to an extension 47 of'a lever 48. Figs. 13, 14 and I5 of the drawings disclose the lever arm 46 as substantially straight, although ingeneral practice this arm is bent as more clearly disclosed in Figs. 1, 2 and 3, ywhich figures show the mechanism in assembled relation. Lugs 49 are mounted on the side Wall 50 of the casing 33, and provides an abutting 'surface for the fingers 43 and 44 of the valvemember and also yprovides the range of movement of the valve. But one of these lugs is necessary for providing the abutting means, althoughin actual construction three of these lugs are spaced apart on the surface of the casing and cou'n'` tersunk bolts 49pass through these lugs and into projections on the gear housing for' holding this housing in position. The outlet from the gear pump is designated generally as 51, the' fluid passing from this outlet 51 to the intake of the cylinder 30 by means of a pipe line 52. The intake to the gear pump or drain from the cylinder 30 is desig nated at 53, the fluid flowing back from the cylinder into the gear casing by means of a pipe line 54. A by-pass 55 is provided above the outlet from the cylinder. and comprises a U-shaped tube of smaller cross section which joins with the pipe line 54 nearits upper end.

Figs. 12 and 13 disclosethe Ivalve/41 in its lifting position. Aport 56 from the inlet 53 to the outlet 51 is closed by the valve and thus the fluid has to pass through the lower chamber 57 and gears 34 and 35, the fluid being placed under pressure by the gears. In Fig. 14, the valve is shown in lowering position, both the inlet and outlet beingwdisclosedv as partially opened by the valve. In Fig. 15,

yis disclosed the valve. in holding position, the

valve being shown as closing the outlet port 51 -so that no fluid may escape through this outlet, and thus holding the bucket or scoop at any desired position. In these Figs. 13, 14 and 15, the hand control lever 48 is disclosed in the various positions that it occupies according as to whether the operator desires a lifting, lowering or holding position, respectively. -When it is desired to lift the bucket andits load. the lever arm is pulled tothe rear. Should it be desired to lower the bucket, the hand controlled lever is'placed in a lll vertical position. When theoper'ator desires to hold the bucket 'in its position. the hand controlled lever is pushed forwardly.

, mounted in turn upon this angle iron is a l latch plate 65 having an angularly disposed upper surface adapted to Vbe engaged by the latches 58. The lower end 66 of the lever arm 60 is adapted to impinge against a plate 68 mounted on the rear of the bucket, whenever the handle 62 is operated to disengage the latches from the bucket, while a plate 69 of the bracket assembly 10 is 'impinged against by this lower end 66 whenever'the latches are in holding engagement, these plates determining the range of movement of the lever arm 6 Springs 70 attached to the bracket aembly and tothe lever arm 60, normally hold the latches in engagement with the bucket, al though these springs do not prevent the ready disengagement of the vlatches from the latch plate by the operator.

In order that the bucket may be readily disengaged from the brackets 10, I provide a detachable, pivoted support. The ',detaching means is clearly disclosedin Figs. 16 and 17 of the drawings. In this construction, the opposite brackets 10 'are provided with U- shaped cut-outs 71 which provide abearing for the stub shafts 72 mounted on and providing a pivotal support for the bucket. The members 71 are further provided with an` inwardly extending shoulder adapted to engage with a centrally disposed groove in the split bushings 73. Thev split bushings Vare provided with extensions having openings aligned with openings in the U-shaped bearing members 71. Afbolt 74 is adapted to be passed through the openings and to hold the split bushings in position. Plates 75 are securely attached to the inner side walls of the bucket 11, andare `mounted upon the inner end of the shafts 72. In order that there may be no projections upon the plate 75, the rivets or other securing means 76 are countersunk, thus providing a iush surface with the face of the plate.

In initial or loading operation, the bucket is generally lowered in the position shown in Fig. 1 of the drawings, although our construction is suitably adapted to operate at any suitable height above the level of the ground on which the tractorisbeingopcrated. This operative range in height is generally about four feet above the ground, or more particularly at an altitude not to exceed'that of the lower position of the slide 19, the reason being that up to this point, the entire order to trip the bucket or A.

thrust is on the rear axle not on the boom l or vertical members 18.

When it is desired to raise the bucket and its contents, thegear pump 'is operated, the valve being placed in the position shown in Figs. 12 and 13 of the drawings for forcing the iiuid under pressure, through the outlet 51 tothe inlet at the base ofthe cylinder- 30, thus forcing upwardly the piston in the cylinder 30. The bucket and arcuate lugs will then be swung through an are until the lugs 22 engage; with the slides 19. Thereafter, as the bucket is being raised, the arcuate lugs'will no longer be raised through an arc, but rather vertically, the, H-beam 9 of the boom be-y, ing drawn forwardly by means of the slide 7 on the member 4. Whenthe bucket has been raised to the altitude desired, the operator, by means of the hand control lever 48 causes the valve in the gear pump to assume the position shown in Fig. 15 of the drawings, and thus hold the bucket and its con'- ltents in the desired position. The operator then pulls upon the handle .62 disengaging the tripmechanism from the bucket and allowing the bucket to assume the position shown in the dotted outline of Fig. 2 for discharging `its contents. The operator next lowers the bucket by moving the hand control lever to a vertical position and causing the valve of the ear pump to assume vthe position shown in' ig.,14 of the drawings. As the bucket touches the ground, it is tilted upwardly and the latches will engage the rear edge of the bucket for holding it in normal operative ositon.

Althoug we propose to use oil as our hydraulic ,Huid or medium, we do not desire to be limited by any articular Huid in the operation of our mec anisln.

Having thus disclosed the invention, we

y1 In' a hydaulio digger and loader mouhty ed on a tractor, telescopmg booms positioned at the opposite sides Aof said tractor and mounted on the rear axle of said tractor, means for extending said booms upon a raising of the same, and a bucket mounted on the forward ends ofsaid booms.

2. In a hydraulic digger mounted on a tractor and provided with a bucket, castings adapted to encircle the rear axle of said tracy tor, telescoping booms positioned at the o site sides of said tractor, slides positioned on said vertical beams, and lu s mounted near the forward 'end of said ooms and ada ted to engage said slides when the booms are eing raised.

4. In a hydraulic digger and loader mounted u on a tractor and provided with a bucket, te escoping booms positioned at the opposite sides of said-tractor, said booms bemg mounted upon the rear axle of said tractor, vertical beams mounted on the opposite sides ofsaid tractor, guide slides -positioned on said vertical beams, a stop mounted on said beams for limiting the downward movement of sald slides, and lugs mounted on said booms near the forward end thereof and adapted to en gage said slides as the booms are being raised to discharge the contents of the bucket.

5. In a digger and loader mounted upon a tractor, telescopingmeans positioned at the sides of said tractor, a bucket positioned at the ends of said means, hydraulic means for raisin said bucket and means for extending said telescoping means as the bucket is being raised.

6. In a digger and loader mounted upon a tractor, telescoping booms positloned at the side walls of said tractor, a bucket mounted on said booms, vertical beams mounted on the side walls of said tractor for guiding said booms, an hydraulic pump directly dr1ven `from the power take-olf of said tractor, hy-

draulic means operated by said pump, and a three-part cable operatively connecting said hydraulic means and booms for ralsmg sa1d booms and bucket.

7. In a vhydraulic digger adapted to be mounted on a tractor, telesco mg booms mounted on said tractor, a buc et mounted on the forward end of said booms, upright members mounted on the forward end of said tractor, and means associated wlth said booms and members for extension of sa1d booms.

8. In a hydraulic digger` adapted to be mounted on a tractor, telescoping booms mounted on the rear axle of said tractor, a bucket mounted on the forward end of said booms, upright members mounted on the forward end of said tractor, slidable means on said members, and means connected to said booms andadapted to engage said slidable means for extension of said booms when the same are being raised.

9. In a hydraulic digger adapted to be mounted on a tractor, castings mounted `on the rear vaxle of said tractor, telescoping booms on opposite sides of said tractor and provided with a bucket at ltheir forward ends, said booms adapted to contact and abut said castings forV transmitting the entire thrust of the bucket and booms to said axle during the digging operation, and means for guiding and extending said booms when the same are being raised.

10. In a hydraulic digger adapted to be mounted on a tractor, telescoplng booms mounted on said tractor whereby any thrust on said booms is transmitted direct to the tractor, a. bucket mounted on the forward end of said booms, and means associated with said booms for extension thereof upon a raising of the same and for elevating saidbucket substantially vertically.

11. In a hydraulic digger adapted to be mounted on a tractor, telescoping booms mounted on said tractor, said booms comprising elongated members adapted to seat one within the other, a bucket mounted on said booms, said members seating for transmitting the thrust of the bucket to said' tractor when the same is lowered and during the digging operation, and means for raising and lowering said bucket.

, 12." In a hydraulic digger adapted to be mounted on a tractor, telescoping booms mounted on said tractor, said booms comprising elongated members adapted to seat one within the other, a bucket mounted on said booms, said members seating for transmitting the thrust of the bucket to said tractor when the same is lowered and during the digging.

operation, and means for effecting an extension of said booms upon a raising of the same.

13. In a hydraulic digger adapted to be mounted on a tractor, telescopic booms mounted on said tractor and comprising elongated members slidable one within the other, a bucket mounted on said booms, one of said members providedA with a collar adapted to contact and seat with the other ofvsaid members whereby the thrustof said bucket is transmitted to said tractor during the digging operation, and means for raising and lowering said bucket. f

14: In a hydraulic `digger adapted to be mounted on a tractor, telescopic booms mounted on said tractor and comprising elongated members, a bucket mounted on said booms, a sleeve mounted on one of said members, the other of said members being slidable in said sleeve and provided with a collar adapted to seat with said sleeve whereby the thrust of said bucket is transmitted to said .tractor during the`digging operation, and means for raising and lowering said bucket.

15. In a hydraulic digger adapted to be mounted on a tractor, booms mounted on each side of said tractor, a bucket mounted on the forward end of said booms, vertical members mounted on the forward end of said tractor, and hydraulic. means including a casing secured to said members for'raising and lowering said booms and bucket.

16. In a hydraulic digger adapted to be mounted on a tractor, booms mounted on each side ofvsaid tractor, a bucket mounted on the forward end of said booms, vertical members secured to the forward end of said tractor, a

casing mounted yon said tractor and secured to said members, and a hydraulically operated cross-head in said casing connected with said booms and bucket for raising and lowv ering the same.

17. In a hydraulic digger adapted to be mounted on a tractor, telescopic booms mounted on each side of said tractor, a bucket ,y mounted on the forward end of said booms,

' vertical members secured to the forward end` mounted on the sides of said tractor, a bucketl of said tractor, means on said members for effecting an extension ofsaid boomsupon a raising of the same, a casing secured to said members, and hydraulically operated means in said casing` for raising and lowering said booms and bucket.

18. In' a hydraulic digger adapted to be mounted upon a tractor, telescopic booms mounted on the sides of said tractor, a bucket mounted on said booms, and hydraulic means mounted on the front end of said tractor for raising and lowering said bucket.

19. In a hydraulic digger adapted to be mounted upon a tractor, telescopic booms mounted on the sides of said tractor, a bucket mounted on said booms, and hydraulic means including a hydraulically operated cross'- head operatively connected with said booms and bucket for raising and lowering the same.

20. In a hydraulic digger adapted to be mounted upon a tractor, telescopic booms mounted on the sides of said tractor, a bucket mounted on said booms, hydraulic means including a cylindrical casing mounted on the front of said tractor, and a cross-head in said casing and hydraulically operated for raising and lowering said booms and bucket.

21. In a hydraulic digger, adapted to be vmounted on a tractor, telescopic booms mountedon the sides of said tractor, a bucket mounted on the forward end of said booms,

vertical members mounted on the front of said tractor, means on said members for guiding said booms, and hydraulic means including a casing secured to said members for raising and lowering said booms and bucket.

22. In a hydraulic digger adapted to be mounted on a tractor, telescopic booms mounted on the forward endof said booms,

vertical members mounted on the front of said tractor, means movably-mounted on said members for guiding and effecting an extension of said booms upon a raising of the same, and hydraulic means including a casing secured to said members for raising and lowering said booms and bucket.

In witness whereof, we hereunto subscribe our names to this specification.

RUSSELL B. NORTH. FRANK G. HOUGH. ROYAL R. MILLER. 

